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Tracer test in Hobol Creek, Norway, under different flow conditions

Wörman A., Klove B., Wachniew P., Czupryński P., Packman A.

Acta Geophysica Polonica

2005

Vol. 53, nr 4

517-526

The current paper describes a repetition of a tracer test using tritiated water in Hobol Creek, Norway, under two markedly different flow conditions in August and in October 2002. By carefully fitting a one-dimensional model of the solute trans-port in the creek, various mixing parameters could be evaluated and compared be-tween the two occasions. The change in residence time in and exchange rate with the hyporheic zone caused by the difference in flow could be well accounted for in terms of the "pumping" theory. The pumping theory represents the hydro-mechanics of the exchange flow. Further, we found that at least 70% mass recovery is needed to provide an accurate evaluation of model parameters and this can only be achieved up to a limited stream distance.

Kinematic model of solute transport in stream networks: example with phosphate retention in Morsa Watershed, Norway

Wörman A., Klove B., Wachniew P.

Archives of Hydro-Engineering and Environmental Mechanics

2004

Vol. 51, nr 1

41-53

A theoretical description of reactive solute transport in a network of stream channels is derived by convoluting unit solutions based on a physical representation of transport and topographical information of the distributions of solute load as well as pathways. The theory is applied to a generic analysis of the phosphate export in Morsa watershed due to the load from 620 individual households with a local wastewater treatment. Essential factors for the phosphate export is filtering of the water in stream-bed sediments through a distribution of hyporheic flow paths of various lengths. This generic study indicates that a significant portion of phosphate is retained in the hyporheic zones for a long time. The 90\% recovery time following a hypothetical remediation action in the households is expected to be in the order of one decade.